Camera Body Lens Communication Mode Switching
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Solution Overview
Problem
Existing communication methods between camera bodies and interchangeable lenses in digital camera systems are inefficient for continuous shooting modes, requiring redundant operations and being unsuitable for the higher communication speed needed for movie shooting, which limits focus correction and aperture adjustment.
Innovation Solution
Implementing a camera system with a selector for shooting modes and a communication unit that employs multiple communication methods, allowing bidirectional communication without the need for a lens information request command in movie shooting mode, using methods like UART and synchronous clock communication to optimize data transfer speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the camera body uses known communication methods designed for still image shooting, then compatibility with existing lenses is maintained, but communication speed is too slow for continuous shooting modes
Solution Approach 1:
The communication unit dynamically switches between a first communication method (slower, compatible with existing lenses) and a second communication method (faster, for movie shooting mode) based on the selected shooting mode. This dynamic adaptation allows the system to optimize communication speed for movie shooting while maintaining backward compatibility with existing lenses that may only support the first communication method.
2Reliability
If the camera body sends lens information request commands frequently to monitor lens state, then focus and aperture control is improved, but redundant communication operations increase
Solution Approach 1:
The interchangeable lens autonomously transmits lens state information (focus state, aperture state) to the camera body using the second communication method without requiring the camera body to send request commands. This self-service approach eliminates redundant communication operations while ensuring continuous monitoring of lens state for reliable focus and aperture control during movie shooting.
3Measurement precision
If the camera body requires three communication operations to read data, then data accuracy is ensured, but communication efficiency decreases
Solution Approach 1:
The second communication method enables continuous transmission of lens state information from the interchangeable lens to the camera body without interruption by request-response cycles. This continuous action maintains data accuracy by ensuring up-to-date information is always available while dramatically improving communication efficiency by eliminating the back-and-forth request operations.
Data Source
AI summary
The present invention relates to a camera system.The system includes a selector configured to select one of a still image shooting mode and a movie shooting mode, anda communication unit employing a plurality of communication methods by which communication between an interchangeable lens and a camera body is performed. If the still image shooting mode is selected by the selector and a lens information request command is sent from the camera body to the interchangeable lens, the communication unit operates such that information on the interchangeable lens is sent from the interchangeable lens to the camera body. If the movie shooting mode is selected by the selector, the communication unit operates such that the information on the interchangeable lens is sent from the interchangeable lens to the camera body even without the lens information request command being sent from the camera body to the interchangeable lens.